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Phosphorus and Nitrogen in Rainfall Simulation Runoff after Fresh and Composted Beef Cattle Manure Application

^a Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, T1J 4B1 Canada
^b Lethbridge Community College, 3000 College Drive South, Lethbridge, AB, T1K 1L6 Canada
^c Department of Renewable Resources, General Services Building, University of Alberta, Edmonton, AB, T6G 2H1 Canada
^d Alberta Agriculture, Food and Rural Development, Lethbridge, AB, T1J 4V6 Canada

View larger version (21K): [in a new window]   Fig. 1. Least-squares means (LSM) values for interaction effect of amendment type x year on concentrations of total phosphorus (TP) (a), particulate phosphorus (PP) (b), dissolved reactive phosphorus (DRP) (c), and NH4–N (d) in runoff from a clay loam soil in southern Alberta. The LSM comparisons are valid for horizontal bars (within year). The LSM values followed by different lowercase letters are significantly (P 0.05) different, whereas those with no lowercase letter are not significantly different.

View larger version (25K): [in a new window]   Fig. 2. Least-squares means (LSM) values for interaction effect of amendment type x rate x year on average loads of total phosphorus (TP) (a), amendment type x rate effect on dissolved reactive phosphorus (DRP) (b), amendment type x year effect on DRP (c) rate x year effect on DRP (d), amendment type x year effect on total nitrogen (TN) (e), and amendment type x year effect on NH4–N (f), in runoff from a clay loam soil in southern Alberta. The LSM comparisons are valid for horizontal bars. The LSM values followed by different lowercase letters are significantly (P 0.05) different, whereas those followed by the same letter are not significantly different.

View larger version (21K): [in a new window]   Fig. 3. Relationship between total phosphorus (TP) (a) and dissolved reactive phosphorus (DRP) (b) in runoff and application rate of fresh manure (FM) and composted manure (CM) after one (1999) and two (2000) applications of manure to a clay loam soil in southern Alberta.

View larger version (18K): [in a new window]   Fig. 4. Relationship between particulate phosphorus (PP) nad total suspended solids in runoff (a), dissolved reactive phosphorus (DRP) concentrations in runoff and Kelowna-extractable phosphorus (KEP) (b), and DRP concentrations in runoff and water-extractable phosphorus (WEP) (c) for fresh manure (FM) and composted manure (CM) after 2 yr of manure application to a clay loam soil in southern Alberta.